Not worth the money!
One of the things I did like was the beautiful and expansive terrain, with lots of items to find. Controls for casting spells is better than in previous Harry Potter games, and some of the boss battles can be challenging.
I absolutely hated the aiming reticule, it can be very frustrating, as are attempts to move items with magic. Like Metroid Prime: Corruption, this game's developer should have borrowed from Twilight Princess, which has an easy-to-see targeting reticule.
Like Metroid, the targeting reticule can easily seem to disappear in the heat of battle. Some of the mini battles (like with Slytherin enemies) are, because of a weak targeting system, almost impossibly random. Just stand a fire away, hoping you hit someone. DUMB!
But worst of all is the final boss battle with Voldemorte, which is beyond dumb and way too simple. In fact, it is downright silly; shake the Wii remote up and down, now left and right, until he is defeated. LAME, LAME, LAME!
Overall, I was disappointed, and wished I had found this at a yard sale for half the price.
My advice, wait for a yard sale!